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A weather balloon is inflated to a volume of 28.5 L at a pressure
of 748 mmHg and a temperature of 28.0 °C. The balloon rises in
the atmosphere to an altitude of approximately 25,000 ft, where
the pressure is 385 mmHg and the temperature is -15.0 °C. Assuming
the balloon can freely expand, calculate the volume of
the balloon at this altitude.